Brake-shoe.



PATENTED JAN. 23, 190B.

BRAKE SHOE. APPLICATION FILED NOV. 5, 1902.

J. D. GALLAGHER.

UNITED STALFES PATENT orrron.

BRAKE Specification of Letters Patent.

-SHOE.

Patented Jan. 23, 1906.

Application filed November 5, 1902. Serial No. 130,171.

To all whom it may concern:

Beit known that I, JOSEPH D. GALLAGHER, of Glenridge, in the countyof Essex and State of New Jersey, have invented certain new and useful Improvements in Brake- Shoes, of which the following is a specification.

.- The invention relates to brake-shoes constructed for use in connection with railwa ears, and particularly to the construction and arrangement by which the wearing-surface of the brake-shoe may be renewed or re aired, as desired, all of which will more fully ereinafter appear, I l

The principal object of the invention is to provide a simple, economical, and efficient hrake-shoe-one that may be entirely consumed in service with no waste.

A further object is to provide a simple, economical, and eiiicient brake-shoe made in two or more parts;a holding and wearing partinterchangeably secured together, so that eithgr part may be renewed or repaired, as desire Further objects will appear from'an examination of the drawings and the following description and claims.

The invention consists principally in a brakeshoe in which there is combined an integral supporting back portion and a wearingblock removably secured thereto.

The invention consists, further, in a brakeshoein which there iscombined an integral holding back portion and a wearing-block intermeshing therewith so as to be removable therefrom.

The invention consists, further, in an integral holding back portion provided with a wrought-metal insert cast therein so as to strengthen the back portion, a dovetail thereon, and a wearing portion provided with a dovetail groove rcinovably interm'eshing with the holding back portion.

The invention consists, further and finally, in the features, combinations, and details of construction hereinafter described and claimed.

in the accompanying drawings, Figure l is a side elevation of a brake-shoe constructed in accordance-With these improvements Fig. 2, a perspective view of the integral holding back portion; Fig. 3, a-similar view of the same portion looking at the dovetail front portion thereo'fpFig. 4, a crosssectional view taken on line 4 of Fig. 2 looking in the direction of thearrow; Fig. 5, a perspective view of the rear portion of the wearing part, show-- ig. 1 looking in the direcminimizing this objection, and it is to this end that this invention is particularly designed-that is, to produce a brake-shoe formed of several intermeshing parts so constructed and arranged that when any one part is broken, particularly the wearing part, it ma be renewed Without throwing away the other part. An examination of the drawings will also show that the brake-shoe is so constructed and designed as to get the reatest amount of wear-out of the metal-t at is, the removable wear-block may be removed when it is considerably worn, .a new block ut on, and the old block engaged withthe ace of the new block, so as to entirely wear out the remainder of the old or artly-Worn art.

In constructing a brake-shoe in accordance wlth theseimprovements I make an mtegral supporting holding back portion a of the desire size, shape, and strength to hold and support the other parts in position. This back ortion, as shown in the drawings, is provided with :1- lug b so constructed as to be secured to the ordinary brake-shoe head and in .the usual manner. While only the usual ous that any simple. attaching device may be used on the back of the shoe. be seen .from an inspect ion of Figs. 6 and 7 that it has awrought-metal piece '0 cast therein, which insert is perforated, so that (luring the o eration of casting the molten metal may dbw all around the sameand hold it in intimate engagement therewith, the advantage being t at should the cast portion of the metal insert would still ho cient operative condition. I may also make metal, such as steel or malleable iron.

liable to break.- Various expe ients and devices have been designed for "the purpose of It will further back become broken at any 1pioirfit the wrougflli't 't e part in e 1-- the whole back of some malleable or ductile,

block-an advantage which wil be understood and appreciated by those skilledin the ,lyiaster'Oar Builders lug is shown, itis obvi- It is well known in this art that the braking-surface of the ordinary brake-shoe is subjected to the greatest wearing action, and as a consequence is most liable to break, and if the entire shoe is formed in one integral structure-that is, the wearing and supporting parts made in one piece, as in the usual from of shoe-the entire shoe would have to be discarded when worn thin or cracked in use, while in the steel-back shoe,- though it might be held in condition for efficient use, yet its use would still be objectionable on account of the somewhat impairede'l'liciency,

V and even a steel-backed shoe must be scra )ed before the whole metal of the shoe is use up in service. It is desirable, therefore, to make this wearing part or block in such a manner that it may be removably engaged with the holding back portion and also hold a artlyworn part in position to be completel y used up, so that if the wearing-block be cracked or worn the whole shoe will not have to be scraped. To accomplish this result, I make a wearing portion or block of the desired size and shape and provide it with a dovetail groove e in the rear part, adapted to be engaged or intermeshed with a dovetail lug f on the front part of the holding back portion, as shown particularly in Fig. 7 This dovetail groove, it will be seen, is closed at one end at g, so as to prevent the wearing part from dropping down and out of position, and also to form a sto so as to obtain the desired engagement. f desired, the wearing-block can e held from movement in the opposite direction by a pin; but I have found in practice that the friction of the several parts of the shoe upon each other is-suflicient to prevent this movement. The front part of this Wear plate or block is provided with a dovetail h the counterpart of thatvshown on the holding back, so that it ma receive a partly-worn wearing-block i, as sliown in Fig. 7, and hold it in operative position until such block is completely worn out.

In operation and preparing the brakeshoe for first use the supporting or holding back portion is engaged with a wearingblock d, and both placed in en agement with the usual brake-shoe head. TVhen the block (1 is partly wornsay'to the condition of the part shown at "i in Fig. 7it,.is removed from its position with the holding back portion, a' new block placed in engagement therewith, and a partly-worn block engaged with the front thereof, as shown at i in F 1g. 7.

The principal advantagesof this construction are the economy of repair and renewals and the increased longevity of the shoe.

I claim- 1. A brake-shoe divided into two independent parts having adjacent surfaces extending throiwh the shoe longitudinally between the baci and face, and means for attaching the two parts together, substantially as described.

2. A brake-shoe divided into two independent arts having adjacent surfaces extending t irough the shoe longitudinally parallel with the face of the shoe, and means for attaching the two parts together, substantially as described.

3. A brake-shoe divided into two independent parts having adjacent surfaces ex tending t n'ou h the shoe longitudinally parallel with the face of the shoe, the lower part having its back and face arallelwith each other, and-means for attacliing the two parts together, substantially as described.

4. In a brake-shoe of the class described, the combination of a holdingback portion provided with a dovetail on the front port-ion thereof, a wearing-block provided with a dovetail groove on the rear portion to engage with the holding back portion and a dovetail slide on the opposite side. with which a partlyworn wearing-block may be engaged, substantially as described.

JOSEPH D. GALLAGHER.

Witnesses:

A. E. CUMMING, W. H. JAooBUs. 

